气液两相流界面波非线性稳定性分析研究

Non Linear Analysis of the Interfacial Stability of Gas Liquid Two Phase Separated Flow

通过对双流体模型方程进行简化，得到了双曲型两相流非线性控制方程组．进而导出了该方程组的特征线方程，利用有限差分及特征线方法求解了特征线方程，考察了界面扰动随时间在空间的发展状况，并与实验和线性稳定性分析结果进行了比较．

From the complete two fluid modeling equations of gas liquid two phase separated flow, a set of non linear hyperbolic governing equations were deduced by omitting the effect of the surface tension and assuming a quasi steady state for the gas phase. These characteristic equations were solved by using characteristic line and finite difference. The propagation and growth of the interfacial disturbances in space with time were investigated by using the numerical results in terms of gas and liquid superficial velocities. The comparisons of the non linear stability results with those of the linear stability analysis and experimental data showed that the non linear stability analysis not only can confirm the conclusions based on the linear stability analysis, but also can give an insight into the growth and propagation of the interfacial disturbances on the interface of gas liquid two phase flow.